Jean pierre serve



J. P. SERVE.

(No Model.)

com B0X. l

Patented-Deo. 17, 1889'.

No. 417,591.l

UNITED STATES PATENT OFFICE.

JEAN PIERRE SERVE, OF GIVORS, FRANCE.

vCORE-BOX.

SPECIFICATION formingpart of Letters Patent No. 417,591, dated December 1i7, 1889.

Application led August 7, 1889. Serial No. 320,042. (No model.) Patented in Belgium July 23, 1888, No. 82,643, and in France January 28,1889,No.195,666. v

To @ZZ whom tn/tay concern:

Be it known that I, JEAN PIERRE SERVE, manufacturer, a citizen of the Republic of France, and a resident of Rue des Servettes, Givors, (Rhne,) France, have invented certain new and useful Improvements in Core- Boxes, (for which I have obtained a patent in France, No. 195,666, dated January 28, 1889, and Belgium, No. 82,643, dated July 23,18S8,) of which the following is a specification, reference being had to theV accompanying drawings. Y

The improved molding apparatus or corebox which forms the subj ect of this invention is more especially designed for molding cores employed in the manufacture of any hollow castings having internal ribs or projectionssuch as, for example, tubes of circular, oval, elliptic, or other form in transverse section provided 'with inwardly-projecting longitudinal ribs varying in height, thickness, and number. These ribs may or may not extend the entire length of the said tube, and may Abe either continuous or interrupt-ed, if desired.

In the accompanying drawings is represented, by Way of example, a core-box constructed according to my said invention. Figure 1 is an elevation, Fig. 2 a longitudinal section, Fig. 3 a transverse section, and Fig. 4. a plan, of the aforesaid core-box. Fig. 5 is a transverse section of a tube having internal ribs, the latter being easily obtained when the improved core-box is employed.

The apparatus comprises a kind of mold formed of two parts or half-cylinders A A of metal, whose internal diameter is equal to the internal diameter of the tube to be cast, and Whose length is somewhat greater than that of the tube. l

The abovementioned two parts are provided with longitudinal slits, which are equal in number to the number of ribs to be formed in the tube, and, as shown in Figs. 1 and 2, extend to Within a short distance from the extremities of the said parts. These slits are designed to receive metallic plates or bars B, the length and thickness of which are equal to the length and width of the slips, and which, when in their place, project into the interior of the mold a distance equal to the height of the ribs to be provided in the tube, the form of the projecting parts of these plates or bars corresponding exactly to that of the aforesaid ribs. The thickness of the curved partsAof the said mold must be suilicient to enable the plates or bars B to be firmly maintained in the slits which receive them. These plates or bars are movable in the slits and are held therein, as hereinafter described.

It will be readily understood that if the plates or -bars B were permanently fixed in the mold their converging position would prevent the separation ofthe said two parts, and therefore the removal of the molded core of sand. In order to obviate this diiiiculty, the plates or bars B can be arranged to slide freely in the slits which receive them, so that when the sand has been rammed into the mold they can be moved back a sufficient distance to bring their inner edges flush with the inner surfaces of the mold or box, in which position the two parts of the latter can be readily separated, and the core can be removed.

In order to enable the displacement of the plates or bars to be easily effected, the curved parts AA of the mold are provided at two points of their length with two collars or flanges C, cast or otherwise permanently secured upon the parts A. These collars or iianges have opposite `each slit in the mold an internal recess of the same width as the slit and of the same depth as the distance to which the plates or bars B project into the interior of the mold. By these means each of the plates or bars B can be moved back in such a manner that all its positions will be parallel to each other. As the extent of this movement is equal to the distance which the plates or bars project into the interiorof the mold, the said plates or bars can be completely disengaged from the core of sand, as above stated, their receding movement being limited by the full parts of the collars or flanges C, as clearly shown in Fig. 3.

,For the purpose of enabling the plates or bars B to be easily displaced in their slits, they are provided, either at the points where they traverse the recessed collars or flanges C or at any other suitable points of their length, with metallic rods or spindles D, with the aid of which they can be caused to advance or recede in their slits, so that all their positions will be parallel to each other.

To hold the two parts A A of the mold IOO firmly together, use can be made of two pairs of collars E E and F F, which are represented in Figs. l and 2, and the respective objects of which will hereinafter be explained.

XV hen the core-box is to be used, the two parts A A of the mold are placed vertically and forcibly held against each other by means of the two collars E E, care being taken to place the latter in proximity tothe upper and lower ends of the mold-that is to say, beyond the extremities of the plates or bars B- so as not to interfere with the movements of the latter. 'With the aid of the rods or spindles D the plates are caused to enter the interior of the mold, the degree of the forward movement being limited by means of studs or projections on the back or on the ends of the said plates or bars. By the two collars F F, which are next placed on the mold, the firmness of the connection of the parts A A is further increased, and as the said collars are applied exactly upon the backs of the plates or bars the latter will be held in their place, being prevented from receding. The mold having thus been closed, a hollow metallic rod or lantern, designed to form the axis of the core, is introduced and th'e sand is rammed into the mold in the ordinary manner. This operation being` terminated, the two intermediate collars F F are removed, and after having caused the plates or bars B to vibrate by a few taps with a hammer they are successively moved back through the medium of the rods or spindles D, so as to cause the backs of these plates or bars to bear against the bottoms of the recesses in the exterior collars C of the mold. Having thus made sure that the said plates or bars have been completely moved back into the recesses of the parts A A, it is sufficient to remove the exterior collars E E for opening the mold and easily removing therefrom the cores of sand which it contains.

It will be understood that I do not limitmyself exactly to the forms and arrangements above described, and represented in the accompanying drawings, for displacing, guiding, and retaining the two parts of the mold and the plates. Thus, for example, the collars E E and F F can be either independent or mounted by hinges upon the mold, and the outer collars E E can be dispensed with, the two parts A A of the mold being provided with lugs connected by bolts, so that they can be caused to approach and recede from each other. This mechanical device will enable the two parts of this mold to be rapidly moved at will. The plates or bars B can be moved in a similar manner.

It will be understood that the separation of the mold and core can also be effected by completely removing the plates or bars B through the top part of the mold. Inthis ease the mold is also made of two parts AA, connected by means of hinged collars F F; but the said parts, instead of having slits formed in them, are provided with grooves which extend to the upper end of the mold and present in transverse section a dovetail shape corresponding exactly to the transverse section of the backs of the plates or bars B. Under these conditions it is sufficient to introduce the plates or bars B into the above-mentioned dovetail grooves from the top end part of the mold, in order to be firmly held in place while the sand is rammed into the mold. This operation being concluded, the said plates or bars are carefully drawn out through the upper end ot' the mold, which can then be opened for the removal of the core.

The mold can be formed of any number of parts or sections A A, as deemed preferable, and according to the dimensions and the form of the hollow casting for which the'core is to be used.

lVllat I claim is-' 1. A mold consisting of two or more parts provided with longitudinal slits equal in number to the number of internal ribs which the hollow casting shall possess, plates or bars movable in the slits and presenting the form and dimensions of the said ribs, the said plates or bars being designed to form the depressions in the core which correspond to the ribs in the hollow casting to be produced, and rods or spindles on the plates or bars for drawing them back to permit the opening of the mold when the core is to be removed.

2. A mold consisting of two or more parts provided with longitudinal slits equal in number to the number of internal ribs which the hollow7 casting shall possess, plates or bars movable in the slits for forming the depressions in the vcore which correspond to theribs in the hollow casting to be produced, rods or spindles for drawing the plates or bars back, and collars encircling the mold and provided with recesses coinciding with the slits in the mold to receive the plates or bars when the latter are moved back, substantially as described.

3. A mold consisting of two or more parts provided with longitudinal slits equal in number 'to the number of internal ribs which the hollow casting shall possess, plates or bars movable in the slits for forming the depressions in the core which correspond to the ribs in the hollow casting to be produced, rods or spindles for drawing the plates or bars back, and removable collars encircling the mold for holding the plates orbars against receding movements, substantially as described.

In testimonywhereof I havehereunto sign ed my name in the presence of two subscribing witnesses. i

JEAN PIERRE SERVE. lVitnesses:

GEORGES FREYDIER DUBREUL, XAVIER JANIcoT.

IOO 

